Folding frame for grinders.



PATENTED JAN. 27, 1903.

E. A. JOHNSTON. FOLDING FRAME FOR GRINDERS.

APPLIOATIONFILED OUT. 20, 1902 N0 MODEL.

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EDWARD A. JOHNSTON, OE CHICAGO, ILLINOIS, ASSIGNOR TO INTERNA- TIONAL I'IARVESTEB COMPANY, OF CHICAGO, ILLINOIS, A CORPORA- TION OI NEW JERSEY.

FOLOlitlO FRAME FOR'GRlNDERS.

ClliEiIfidTliOld forming part of Letters Patent No. 719,008, dated January 27, 1903.

Application filed October 20,1902. Serial No. 127,994. 11103813 ll) (d7, wit/0111, it 'n'my concern.-

Be it known that I, EDWARD A. JOHNSTON, a citizen of the United States, residing at Chicago, county of Cook, State of Illinois, have invented certain new and useful Improvements in Folding Frames for Grinders; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The invention relates to the construction of stands or frames for temporarily supporting grinding-machines,especially thosmallsicklegrinders that are nowso commonly employed for grinding the knives or sections of cutterbars for mowing and reaping machines.

The object of the invention is to provide an improved construction of such frame, having particularly in view to make it foldable into a narrow compass for transportation and storage, and at the same time to have the construction such that it can be extended to form an adequate and rigid support for the grinder, as well as to afford a seat for the operator.

The construction has been designed especially for the sickle-grinder of my Patent No. 665,828, of January 1, 1901, but it is well adapted to receive and support most any form of grinder that is provided with clamps to fasten it to a table, block, or other flat base.

As will be seen on reference to the patent above referred to, the grinder therein illustrated and described is only adapted to be operated by hand and is intended to be clamped to the drive-wheel of the machine; but the present improvement adapts that grinder to be operated by foot-power, thus leaving the hands free to manipulate the tools being ground, and also provides a convenient support permitting the implement to be set up when it is desired for use away from the machine and where some sort of special support is required.

The invention is illustrated in the accompanying drawings, wherein Figure l is a side view of a' stand constructed in accordance with my invention. Fig. 2 is an elevation of the front end of the same. 8 is a plan view, and Fig. 4 is a view of the stand closed.

Referring to the Views, a a denote a sectional block, the two parts of which are bolted together by bolts a a a 1) denotes a vertical standard, which is rigidly secured at its upper end to the block by means of the bolts a a above referred to. At the lower end of this standard there is a foot-piece c, bolted crosswise, as shown in Figs. 2 and 3, and which affords a firm lateral support.

Pivotally secured to the block a by means of the bolt a is a diagonal standard or prop (Z, the pivotal connection between this standard and the block being such that the two standards may be folded together side by side, as indicated in Fig. 4.

To the vertical standard Z) at the point b there is pivotally secured a seat-support 8,0011- sisting of two bars, as shown in Fig. 3, which extend rearwardly, one on each side of the diagonal standard (1, and carry at their outer ends a seatf for the operator. The standard dis provided at a point a little higher than the pivotal point I) with a hook shaped bracket 9, and the seat-support e is provided with a pin 7b (preferably removable) which, when the standards are spraddled apart as shown in Fig. 1, hooks into the bracket g and holds the seat-support and seat in the position indicated in dotted lines in Fig. 1. The engagement of the bolt 7b with the bracket g also serves to lock the standards in their open position, so as to prevent the accidental collapse of the frame.

As above stated, the grinder herein illustrated is that shown and described in my patent of January 1, 1901. It is secured to the (lat upper surface of the block a by means of the clamp-screw i in precisely the same manner that it would be secured to the wheel of a mower or to a table or other support. As herein illustrated, the grinder is provided with a small sprocket-wheel 'i, which is attached to the spur-gear 7;, (shown in Fig. 20f the patent,) and around this sprocket-wheel an endless driving-chain on is thrown.

In a bearing 12, secured to the front side of the vertical standard 1) near its lower end, there is journaled a crank-shaft j, which is provided with cranks carrying pedals, as shown in all the views. The chain m is con- ICO nected to and driven from this crank-shaft by means of a detachable sprocket-wheel 70, which is made in sections, as best shown in Fig. 1, and is clamped around the shaftj, just inside one of its cranks, by means of bolts passing through ears that are secured to each section at their meeting edges, as clearly illustrated in Figs. '1 and 4. One section of the sprocket-wheel is provided with lugs Z Z, projecting laterally from a point near the rim of the wheel and spaced apart sufficiently to receive between them the crank of the shaft j. The wheel is thus readily attachable and detachable from the shaft, and the hearing I) for the shaft is of such a length as to bring the wheel in the same vertical plane as the sprocket-pinion e on the grinder.

The construction being as thus described, it is to be noted that by providing for the driving of the grinder by foot-power the operator is left with his hands free to manipulate the tools. It is also characteristic of the invention that the grinder and its drivingsprocket 7c are readily detachable from the frame, so as to permit the latter to be folded and separately packed and shipped. It is also to be noted that when folded into the position shown in Fig. 4 the seat-support e may, if desired, be made to fold down more nearly parallel with the standards b and d by simply removing the bolt h and allowing the seatf to rest on the lower end of the diagonal standard d.

Having thus described my invention, What I claim, and desire to secure, is

1. A folding frame for supportinga grinder, the same consisting of a block to which the grinder may be attached, a vertical standard secured by its upper end to the block, an auxiliary standard pivoted at its upper end to the block, and a seat-support pivoted to one of said standards and having a releasable engagement with the other, whereby the standards may be held apart, or folded lengthwise together with the seat-support.

2. A folding frame for supporting a grinder, the same consisting of a block to which the grinder may be attached, a vertical standard rigidly secured by its upper end to the block, a diagonal standard pivoted at its upper end to the block, a seat-support pivoted to the vertical standard, and a bracket on the diagonal standard with which the seat-support may be engaged to lock the standards spraddled apart and from which said support may be released to permit it and the standard to be folded lengthwise together.

A folding frame for supportinga grinder, the same consisting of a block to which the grinder may be attached, a vertical standard secured by its upper end to the block, an auxiliary standard pivoted at its upper end to the block, a seat-support pivoted to one of said standards and having a releasable engagement with the other, a pedal-crank shaft journaled on the vertical standard, and a de tachable sectional sprocket-wheel clamped around the shaft and locked thereto by lugs engaging one of the cranks.

In testimony whereof I aflix my signature in presence of two witnesses.

EDWARD A. JOHNSTON.

WVitnesses:

CHAS. N. CHAMBERS, W. M. TwoMBLY. 

